Automatic gun



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Patented June 19, 1928.

Unirse s'raras FFE.

NICOLAS EMILIEN METHLIN, 0F PARIS, FRANCE, ASSIGNOR T0 SCHNEIDER & CIE.,0F PARIS, FRANCE, A LIMITED JOINT-STOCK COMPANY 0F FRANCE.

AUTOMATIC GUN'.

Application led October 27, 1926, Serial No. 144,559, and in FranceJanuary 23, 1928.

The present invention relates to an automatic gun of the type of thosewhich, during tiring, recoil in a cradle, the gun comprising, like otherknown automaticl guns, a mechanism for opening and closing the breech, afiring mechanism, a cartridge distributing mechanism, a mechanism forramming the cartridges into the bore of the gun barrel and a device forejecting spent cartridge cases, all these mechanisms and this deviceoperating automatically by means of the energy taken from the recoil ofthe gun barrel in its cradle.

The new un has been designed in such a way as to e adaptedto worknormally as an automatic gun, while for firing a first projectile it ispossible without any great effort. to actuate, by sim le manipulation ofa member such as a han le or a lever, all the mechanisms, which, forfiring the subsequent projectiles, operate automatically.

The firearm has further been designed in such a way that it is possible,still by the simple manipulation of a member such as a lever or ahandle, to carry out contmuous tiring or intermittent firing shot byshot, that is to say, at intervals varied as desired.

The construction of the firearm is finally designed not only with a viewto obtaining the various functions enumerated above but in such a waythat, with/a view to making it possible to increase the speed of firingthe recoil will be as small as possible, and that the forces to whichthe mechanisms are subjected remain practically constant in spite of thevariations in the speed of the gun barrel during the vrecoil and there-entry into battery position.

The firearm comprises, like other known automatic guns, a cover orcasing projecting to the rear upon the breech, but according to theinvention this casing is made movable longitudinally, for example uponguides projecting upon the cradle by means of a mechanism actuated by asimple handle. relatively to the gun barrel at rest, While normally thesaid casing remains stationary while the gun barrel moves relatively toit by recoiling in its cradle and by re-entering into battery position.

In order thatv this mobility may be obtained by simple means, which, atthe same time produce avery small recoil, the move \ments of the breechblock and those of the cartridge distributor are, according to theinvention, produced by guide cams upon or 1n which move rollers, thesemembers (guides and rollers) being carried respectlvely, the ones bymembers movable with the gun barrel, the others by the movable casmg. Asdescribed hereinafter by means of t-he suitable profiles of the guldesthe force developed upon the recoil for the operation of thecorresponding mechanisms remains practically constant during the wholeof this operation in spite o-f the va.- riations in the speed of recoil.

A practical form ofthe invention is illustrated by way of example inFigures 1 to 9 in the accompanying drawings.

Fig. 1 is a plan section along the axis of the gun barrel showing thewhole of the back part of the firearm, that is to say, that part whichcomprises all the new characteristic devices of the invention.

Fig. 2 is a corresponding longitudinal sectional elevation. In these twofirst figures the members are shown in an intermediate position ofoperation a moment before the cartridge is rammed into the bore ofthegun barrel.

Fig. 3'is a longitudinal elevation of a part of dtlQle firearmcorresponding to Figs. 1 an Fig 4 is a sectional elevation of a part celsimilai` to that shown in Fig. .2 and showing the firearm loaded, thebreech closed, with the members in the firing position.

Fig. 5 is a similar longitudinal sectional elevation to that shown inFigs. 2 and 4 the members being shown in the position they occupytowards the end of the recoil, the breech being at this momentcompletely open and the spent cartridge case in process of ejection.

- Fig. 6 is a plan view seen from above with a part in section takenalong the line 6-.6

in Fig. 7, which is a cross section along the line 7 *7 in Fig. 5.

Fig. 8 is a sectional elevation along the line 8 8 in Fig. 1.`

Fig. 9 is a back elevation of a part.

Figs. 10 to 35 illustrate a special form of' the invention. This formenables firing to be speeded up particularly on account of the fact thatthe spent cartridge case can be

